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職稱英語(yǔ)狀語(yǔ)從句知識(shí)
在句子中起狀語(yǔ)作用的句子叫做狀語(yǔ)從句。狀語(yǔ)從句可以位于句首、句中或句末。位于句首時(shí)，從句末通常有逗號(hào)與主句隔開;位于句中時(shí)，從句的前后都必須有逗號(hào);位于句末時(shí)，從句的前面可以不用逗號(hào)。狀語(yǔ)從句按意義可分為時(shí)間、地點(diǎn)、原因、條件、讓步、方式、比較、目的和結(jié)果等狀語(yǔ)從句。狀語(yǔ)從句由從屬連詞引導(dǎo)。1.時(shí)間狀語(yǔ)從句
引導(dǎo)時(shí)間狀語(yǔ)從句的連詞有：after，as，before，once，since，till，until，when，whenever，
now (that)，as soon as，as long as，no sooner…than等。
有些名詞短語(yǔ)也可以引導(dǎo)狀語(yǔ)從句，如：
every time，the moment，the instant. When I saw her，she was watching closely at the photo on the wall. As the sun rose，the fog dispersed. The instant he received the letter，he started off at once. Every time he went to Beijing，he used to visit the Great Wall. as，when和while都可以表示主句中動(dòng)作發(fā)生的背景，也可以表示主句的動(dòng)作與從句的動(dòng)作同時(shí)發(fā)生，如：
As he stood there，he heard what they were talking about. I stood up and wanted to go out，when she came in. till和until在主句謂語(yǔ)為持續(xù)性動(dòng)詞的肯定式時(shí)，作“直到……為止”解，在主句謂語(yǔ)為瞬間動(dòng)詞的否定式時(shí)作“直到……才”解，如：
Let‘s wait till / until the rain stops. I did not begin work till / until he had gone. once，directly，the moment，the instant和as soon as都作“一…就”解，通常可以互換，如：
Once you understand this，you will surely make rapid progress in your study.由副詞加從屬連詞no sooner…than，hardly / barely / scarcely…when等引導(dǎo)的時(shí) 間狀語(yǔ)從句，如果no sooner，hardly，barely，scarcely前置句首，主語(yǔ)與謂語(yǔ)須用倒裝結(jié)構(gòu)。如：
Hardly had the film started when they came. No sooner had we reached the top of the hill than we all sat down to rest.
2. 地點(diǎn)狀語(yǔ)從句
地點(diǎn)狀語(yǔ)從句通常由where，wherever引導(dǎo)，如：
Where there is a will，there is a way. She painted wherever she happened to be.從屬連詞還能與any，no，every等一起構(gòu)成復(fù)合句，引導(dǎo)地點(diǎn)狀語(yǔ)從句。如：
Everywhere you go，you will be warmly welcomed.
3. 方式狀語(yǔ)從句
引導(dǎo)方式狀語(yǔ)從句的連詞有as，as if，as though等，從句通常位于主句之后，如：
He had never blushed as she blushed then.(as作“按照”或“像”解。)
as if和as though都做“好像”解，兩者可以互換，從句既可用陳述語(yǔ)氣(表示可能符合事實(shí)的情況)，又可用虛擬語(yǔ)氣(表示與事實(shí)不符的情況)，如：
I remember the whole thing as if it happened yesterday. His mother loves me as if / as though I were her daughter.
4. 條件狀語(yǔ)從句
引導(dǎo)條件狀語(yǔ)從句的連詞有：if，unless，as / so long as，suppose (that)，supposing (that)，in case，when等。條件狀語(yǔ)從句可以分為真實(shí)條件狀語(yǔ)從句和非真實(shí)條件狀語(yǔ)從句。
�、耪鎸�(shí)條件句：真實(shí)條件句表示現(xiàn)實(shí)或可能的情況，由if引導(dǎo)，它的主句可以是陳述句，疑問(wèn)句或祈使句，可置于主句之前或之后。
If you heat ice，it melts. If it rained，I went by bus. unless引導(dǎo)的否定條件狀語(yǔ)從句，在意義上相當(dāng)于if…not，如：
Don‘t come unless I telephone. as / so long as，provided / providing (that)意為“只要、如果”，如：
You can borrow this pen as long as you can keep it well. in case在英國(guó)英語(yǔ)中表示目的，在美國(guó)英語(yǔ)中可表示條件，意為“如果、萬(wàn)一”，如：
In case the house burns down，we‘ll get the insurance money.
�、品钦鎸�(shí)條件句請(qǐng)參閱第十一章“虛擬語(yǔ)氣”。
5.讓步狀語(yǔ)從句
引導(dǎo)讓步狀語(yǔ)從句的連詞有：although，though，even if，even though，if，for all that，when，while，whether…or，whatever，no matter what等。
although和though意義一樣，都作“雖然、即使”解，都表示讓步，一般情況下可互換使用，只是although語(yǔ)氣較重，大多置于句首。如：
They are generous though they are poor. Although he was Japanese，he spent most of his life in China. even if
和even though都作“即使”解，兩者可以互換使用，如：
She insisted on her own opinion even though / even if he was wrong. if作“即使、雖然”解，也表示讓步，如：
If he is wrong，he is honest. whether…or作“不論……是否”或“不論……還是”解，如：
You don‘t have to worry me whether I am well or ill.為了強(qiáng)調(diào)讓步意義，在正式文體或文學(xué)作品中，常用as引導(dǎo)讓步從句，從句的補(bǔ)語(yǔ)或狀語(yǔ)置于句首。如：
Tall as he was，he couldn‘t reach the top of the shelf. Strong as you may be，you cannot lift it.詞尾為-ever的wh-詞可以與“no matter wh-詞”互換使用，作“無(wú)論……”解，后者常用于口語(yǔ)中，如：
Whoever / No matter who rings，tell him I‘m out. Wherever / No matter where he is，he will be thinking of you.由whenever，wherever，however引導(dǎo)的從句，也可以分別看作時(shí) 間狀語(yǔ)從句、地點(diǎn)狀語(yǔ)從句和方式狀語(yǔ)從句。把它們當(dāng)作讓步狀語(yǔ)從句是因?yàn)樗鼈兂Ｓ衝o matter when (where，how)的含義。
6.原因狀語(yǔ)從句
原因狀語(yǔ)從句通常由because，since，as，when now (that)，seeing (that)，considering (that)等引導(dǎo)。
because，since和as三者的區(qū)別如下：
because的語(yǔ)勢(shì)最強(qiáng)，其次是since，再次是as. because可以回答why引導(dǎo)的特殊問(wèn)句，而since和as不能。
because引導(dǎo)的從句可以被just，only，simply等副詞修飾，也可以用并列連詞構(gòu)成并列的because從句，而since和as則不能。如：
We pardoned him only because he was still young. for表示原因時(shí)，作“因?yàn)?rdquo;解，多用于正式文體，有時(shí)可以與because換用，但for從句只能置于主句之后。如：
She didn‘t go to school，for / because she was ill. now (that)和seeing (that)都作“既然”解，通常可與since或as換用，如：
Now (that) you have come，you may as well stay. Seeing (that) he is inexperienced，he is not fit for the work.
7. 結(jié)果狀語(yǔ)從句
引導(dǎo)結(jié)果狀語(yǔ)從句的連詞有：so that，so…that，such that，such…that，that等。
當(dāng)從句前面有逗號(hào)時(shí)，so that中that可省略，如：
It was dark，so (that) we could see nothing in front of us.“So 形容詞 / 副詞 that”是引導(dǎo)結(jié)果狀語(yǔ)從句的常用結(jié)構(gòu)，如：
He talked so loud that he annoyed the speaker. He was so brilliant that he made a lot of inventions. “such (a) 形容詞 名詞 that”與“so…that”的意義相同，如：
It was such a hot day that people could not go out. He painted such beautiful pictures that the visitors were lost in admiration. that可以單獨(dú)引導(dǎo)結(jié)果狀語(yǔ)從句，如：
The question is of great importance that it cannot be neglected.
8. 目的狀語(yǔ)從句
引導(dǎo)目的狀語(yǔ)從句的連詞有：in order that，so that，so，that，in case，for fear that，lest等。
in order that與so that的意義和用法基本相同，in order that多用于正式文體，常表示經(jīng)過(guò)認(rèn)真考慮的目的，如：
In order that he would have more space for painting，he bought a big house. You ought to write to him，in order that he won‘t feel we are hiding things from him. So和that可視為so that的省略形式，但不如so that常用，如：
Bring it closer so / that I may see it better. for fear that，in case和lest都表示否定的目的，相當(dāng)于so that…not或in order that…not，作“以免、以防”解。
He wrote the name down for fear that he should forget it . lest限于正式文體，它所引導(dǎo)的從句中的謂語(yǔ)動(dòng)詞多用should be型或be型虛擬形式，如：
He hid the box lest it (should) be stolen. in case引導(dǎo)的從句謂語(yǔ)既可以用虛擬形式，又可用陳述語(yǔ)氣，如：
Better take more clothes in case it is cold. She doesn‘t dare to go out in case she is recognized / (should) be recognized.
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